Basic Geometry Terms and Definitions

Part of a line that consists of two points, called endpoints.

• Line
• Ray
• Angle
• Line segment

Tags

CCSS.HSG.CO.A.1

A point that divides, or bisects, a segment into two congruent segments

• Midpont
• Vertex
• Bisector
• Intersection

Tags

CCSS.HSG.GPE.B.6

An angle with measure between 90° and 180

• Acute angle
• Obtuse angle
• Right angle
• Straight angle

Tags

CCSS.4.G.A.1

Two dimensional and extends without end, even though the drawing appears to have edges

• Line
• Line segment
• Plane
• Ray

Tags

CCSS.4.G.A.1

Has no dimension and is represented by a dot 

• Point
• Plane
• Line
• Line segment

Tags

CCSS.4.G.A.1

Part of a line that consists of a point called an endpoint and all points on the line that extend in one direction

• Plane
• Line segment
• Ray
• Angle

Tags

CCSS.4.G.A.1

An angle with measure equal to 90°

• Acute angle
• Complementary angle
• Straight angle
• Right angle

Tags

CCSS.4.G.A.1

An angle with measure equal to 180°

• Straight angle
• Supplementary angle
• Linear pair
• Obtuse angle

Tags

CCSS.4.G.A.1

Two angles whose measures have the sum 180°

• Complentary angles
• Supplementary angles
• Obtuse angle
• Straight angle

Tags

CCSS.7.G.B.5

Two angles whose sides form two pairs of opposite rays

• Vertical angles
• Adjacent angles
• Straight angle
• Linear Pair

Tags

CCSS.7.G.B.5